When you get fingered up the bum when you need a poo, the resulting poo ends up on the fingerers finger.
Zooey; Don't finger me up the bum, i need a poo
Jim; Urrh i got poo on my finger.
Jim got a Finger Poo
Jim; Urrh i got poo on my finger.
Jim got a Finger Poo
by SuperCliff June 03, 2009